<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--外部书写的方式，放中间会被忽略-->
<script src="./js/my.js">
  /*这个中间写代码会被忽略掉*/
</script>
</body>
</html>